Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ef49405b1f30590875511e55fa43956d96eac19f5d8c66522e806f58c9cc401' 
  AND token = '9U6bjTjBN6IcR51iR8PUOJXi4bjG2TGTRVaRXnN/NmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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