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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'eadc22679260f7381b8286ff08739d0de8eedb6ad30b6532801cf5804bd91323' 
  AND token = 'Lxc/af7HsPmNcJaHGzY89N432KXeoZ7icPj65FzipFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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