SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '30441f1d4b907ae90f43e6fddf9dda7966b1186696c0727b24e166bfca9ac125' 
  AND token = 'EqUIYCGInEPF1gFy0+W9nbSLj90qYyyBVXiAWll0Zmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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