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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a899fe21742034afc045d4cb6d8a2085cc2e30f9f586b2e5d90fd199b7bc5fcd' 
  AND token = 'MwHPLiEdJS7awzJujlL8g747hYqaAV7btxidJ5TaTxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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