Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6668b0372a1761504e22b6e2914438180857c9cc7a0b19fc8cca8d933d2bfa82' 
  AND token = 'tTAGx0PEdRY+vp15pidvjeMDRK0a4vDbLXGhf67VDqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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