Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b664f90adfe91501188bef137223453fb38171c256cf33866c81344e08921d67' 
  AND token = '0Q4lj6DfcXprknLdHfxELy8QKktbcvIMZx81fEA9A6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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