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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0c77999258a3dbbfb2a44dd0194f4b9f423fbf0e6c44aea3f87434f5618e78b7' 
  AND token = 'sPCWdFRNaWNMpd3HrTnm6J8WCK9ejgJtdxrVs3M/VNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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