Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f758c5dc9fd9f3d7d3167d5d9dee22decc6f3e37afc49017891c97a96a1e0aa5' 
  AND token = 'tsP/L+cFm+cEJLQ4Ie0xpCzV1HvnVOlmCigoOW9mbmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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