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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ee15f0f07242dbe6beffb1283e97af136872b6a2b65de033832a59186ed0d34c' 
  AND token = 'yNIpP8JFh6xyq+SIjdQYF4/yaMpUifmO3iOxO+sqU+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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