Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9078b26f8ca0a9624d6be1bae909dbf2cf178f5c1e43f08a0a5fb8dddb688d2' 
  AND token = '5sqf/l9VwUf7ijwQkNmRTEvhsVVGR/+fOcH+sb9CABI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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