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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1a69a06fecc8ad10815720c9e4ce1682c13624eba56ccf4f00ebd322c41cae05' 
  AND token = 'jeRdKjyDkzWRxnyY/l4FduQeNGQLSaG3PDo//F6D95o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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