Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '538923c28be713095e9c78fb71680de794bbda28aa8492822aa354127cb290b2' 
  AND token = '+8pTCl0fLJXopgSUKMbg6TqsD74QZXTSXKUfhbq06YY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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