Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f997e591c82e48df6c47d9f0fb4aca8d128ec4c5bb3a76d5fd3c9d12f2be6019' 
  AND token = '2tVJU4UeH/TDHTPm/QTMFjiXKMDSoCTbTJbdAOOboOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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