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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'db3234ac54b10107b4c891698a772a23a49a76df53a8d244f02ce1cb1d650726' 
  AND token = 'lCywKmrdEE28lUim/4Ha90esoR9G/fFxRcOHnJccY/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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