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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9067f9065662a699fcfff90e1c4e8d600e8096d562251151350270bb73e9ab9f' 
  AND token = 'xSf07qFXzjDJZdyULPRnnYcAPZjd5iSe259gB2wnONY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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