Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca9b24f6ac7a7e4be2e1478ac30826ed0988ed4dbf3e7f19edf4dd5ef40a21d0' 
  AND token = 'ygTWEd4BOUWz0Vj+Qow2j1ZuCS2VWaxoTZsKRgVCIhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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