Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ac5b5928060cd8668842e0d740d8125e0d76c05cdc876b7543da3f5886277ae8' 
  AND token = 'ZXJHHGC2OFevtWDgUfFidqf5CcFxzyBfku8EQVbIykQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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