Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e046a12edb9dc260f971b6b69c2dc75b152e761f9ef5d4ea27f472760b7a5c4e' 
  AND token = 'xdy4CPnfQqhXhHKkbvtcqREGaL0bV39Rrtf0FLi6W0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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