Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b78c6d0e32cf4fb0c61eca27e532a202e9de65d397e1a9177aa379f4adc45670' 
  AND token = 'x+CTfqgKPNcYeU1xyuxqgekUOfJ41hP6mWinkJEsfmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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