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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '56e4c07d1d83e78f54489dab24a0293c278abc9b817ae537f4f6e1e4da9a1fd6' 
  AND token = 'KjHFJdvFz+3HeVBQkbsV5Te9DhknxDFEOJ3tKaTV2lE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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