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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '17f64bbf586bbfa1de0486a5a50799205d8ec4141baec6cd160c20739d4bff58' 
  AND token = '0S3gTrtTxJzWiTgb9hLeCFO75jbAf1vju9lalSySHOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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