Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c558f18cd4c3d4d42b00c379c1d2405a499d2d0399f4036df9e77b6fb8fd3b1a' 
  AND token = 'cMpR/qkrAIGdk7jXJ2b6y/8PwfwYJJo/4R1zDa4Avpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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