Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac4400da8a4b6adce75e3da452e3936bf73fdfb7c8c992868643a012a0f29a82' 
  AND token = 'XrDQELe9iCMSQVbsBIVXF+lVl6DJYBaedU4MmnT7ga0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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