Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a28d592129c294799c55077e2477330b3ad2d301052dd82a35e74fae65555080' 
  AND token = '1mE3jdZQJ1EgnGvVhdxN3rv79R9K0FxEop8G9fIRXyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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