Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cde76f5d0371685128e5e64704b864c825d4c7e40b088a37fbfac0edfcdfde1' 
  AND token = 'SHgPGi1Jb8wxI+L/+RSTGxqYIZh+4BTt+Hx/5qx40HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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