Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d3ee226e47bd27768c551e9ba31fde4d10ba72ebd1d36a124fba39f9f5ebbb3' 
  AND token = '7zgN0fnAQZiXAU5Cx4Q8HSTS2MsHA4XDzXiuKIL5dYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}