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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9fafbf18a6fdf76c4fc8299652e7cc09d111053a25b7b467bdf23c924b5b7e4b' 
  AND token = 'ToLO8ezjfb0rhnvLLDf0sogv5be4iJyQILudCp+CkOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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