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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fe8edb7e12c80894ff62226a3299accdfb35ada504fa182ab57c59d386a4bcb6' 
  AND token = 'EB9MsGGdRzEsttwC6hCk4Cu9nGWmNj+0hoT2+XQ7Re4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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