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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e5dc745f59ce616ec6c57d32b63979ef24fab2fe2f2dbab0c958b09decd492d2' 
  AND token = 'bgNA84E/+EUE8TGa2ffXjtBA0Tr6t+Z2jWv/02Xd2X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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