Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a46933536a2fffa25d7dfc8964c6ab10003e9b0ad97f736cbe5e65723df9b51' 
  AND token = 'sQ325yLFjzSEZlzILlKm/BvRSzeqxML8buHTsLSIg5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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