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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'da12c271cfdf3873b8fa853108f4556bd8421600429c3dbe8f23d3c35c4b3de4' 
  AND token = 'N6zSPecve4tJB/6utHlM7t2wIK9wId38cAiYqNPVQHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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