Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a75c631d0cdbfef1003b537edadc704585168630d1ed569454a8292cf64acdb' 
  AND token = '39z3ta4XoYL9qfhircZ1HjtA66ER/v8Uaq/fCcJLHYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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