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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6b33612194e51f0f12c5939550057369538017db082e54f2b72d42c6692cf27c' 
  AND token = 'Yx7JEFIGMbkevEzqMD/7TTqY96vxFdK0r0dgh352C0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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