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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3adea05605e00fa2d506fdfdd1cafaab7680231ec04ce915a7b4943485abc153' 
  AND token = 'iSyAw8/VHt5Xzo5hHKdg6/AR027wsa0ocZV0K7iYFR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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