Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a22991bd1c281351868ffc675aa6997346c29dec936cb6b580d4e5b7e6fc1d2' 
  AND token = 'kGXrlgi6uUtd8uFDqo7G9nIaCcrG/RPl+aTIuAUr/5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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