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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5a24babf95ec1c55096b8ad9be6c547b4cb9403ac9d424788e1aebea7279ded2' 
  AND token = 'ZIT7UWDSrl/vEVacScyguTrNw2wRf1fFgE2akDHD17M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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