Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f38bd41f882fd4cd6e30810d0cd5d20f4a90f1c23e6e9777b1d13c9cebe88f67' 
  AND token = 'di7ZTelXJm7DoPVT4bEsUonvK/hNyrapDQdDxrn/QF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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