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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e376046a0e1b7497ae7bef177a8203a6dcc11b65fccf1905a908d04b306f963c' 
  AND token = 'fUepqsPvflqV0PT9zU1h7nOLPHnUUe4SIXlLY2ldJIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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