SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fc70740905b6249928fecfca54cdd2053d3a3e7a1a60eaa9c896c4d5767bea23' 
  AND token = 'G9CMxISK5JRBZqjzQ6DgRbpvabRu4B7sgBaUh/mYtX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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