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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6ddac55f77974ffa2a4a0b45fbb50519fcdef7056f17e704eadef09db64afd01' 
  AND token = '2+ExeaWo6QkZiMO5BNEIwULo+lYA9L/p2plH4+Ra69U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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