Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cb058d86aa2df9b2ab3e5e529a2c8b3c8a6725220214c4707001b0979e387f87' 
  AND token = '1LX6jBBpJ0Sx6ccnvJ1JoTGHpnj17aElR3MgovYf/eE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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