Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c28434c83f812300a87dbc81d96a3229ed6323a56bb07e3863a64364bd7ed442' 
  AND token = 'lCucOqMUbdXFDX0e9o2uYM/Op30xEnpd24CvzUrPYrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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