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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3d56b93c83137b58271c8a14491092dc5c60c4a8e008ff2459f5e4ff9b7f163d' 
  AND token = 'v9KyKWdspbzGKBIA8jdaO4D51ITUNsx9QqOONTPcq9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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