Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '397d926c124190ae9841dc4d01353d49fd8c53bf3e3bfb968267def03d930027' 
  AND token = '+K0y5CjxTG5JKNBwopSMth2kIkki7PB9GujGcUnrT04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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