Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3c1eaa919190fa2cc70dc387c90e1bf2fcc6f0b9ca23b22c49daf2fecb20b1a' 
  AND token = 'fwmQhcGZGSVs9ySwnubnsGA5ma9WRZhfsA/yW51983U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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