SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7cf89045d85b13fd0e7d8a34cc5659f477f0805beeaa25637bf94711e4d41be3' 
  AND token = 'UNvXA2+EQHj6CzpHJnhlm3jh/CZWSRxVz15t7KfY7q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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