Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb4f5e0d4a03cb162532e2f4884016e6af91725d154b4f268cd4cdbd6cadb82' 
  AND token = 'f6uVFxshCWgRQb/KlQFH+AQXJ5dTCUrcWERoZwFd1zQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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