Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4160a03e51341803f60dab4ca2be5c986c2748e18d20b8fac3a2791698478a0d' 
  AND token = '+a65dgcENnRa+USk994g9s1QwclaOCtWS2v3IUzE6Oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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