Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '552abd6bbd625048d1f302e3245473fc4a46e985bc28ffb015b8216ca5f9a36e' 
  AND token = 'nsnpgY0RWLeGmG1SlGMIDP/6Ad4Lynn3KWpto62B8OU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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