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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4f44a706a0d99cf291317d63c8bdbb446f9f3f08f48c4a365539dd9136caf4b4' 
  AND token = 'SzxvSZTXKFY3fc9Vf5F39N4XQ+yI3kVdZyNLbcSV80M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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