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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '20b5717a05aa0c0b08734405a7004e8033577f47f4b331f6222f2dff6f6f7ace' 
  AND token = '9dSe5W6mj2yL0sOEmeLs4iEr9aL0Ef0I2DZBYb3kziI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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