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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cc3d66a16576db69f6291c4acf31243b14fa185c06f8c14f366a10b5c06ec76f' 
  AND token = 'Tzp3TQZz3a+i6JH9pfKImdpbzd2sJi7Yf92MfhNKcA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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