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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'dfeee7f6392ce37e8917c3cb09c6cecfc7e665c606c48badc47b66b80181d058' 
  AND token = 'HMaiNoTDzHqRHwqqC2rCkezGZ1jx5yDDDc7cBOCgK18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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